DB3 Discrete Semiconductor Products

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Voltage - Breakover:	28 ~ 36V
Current - Breakover:	50µA
Current - Peak Output:	2A
Operating Temperature:	-40°C ~ 125°C (TJ)
Package / Case:	DO-204AH, DO-35, Axial
Supplier Device Package:	DO-35

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Thyristors - DIACs, SIDACsA thyristor is a device made up of two or more semiconductor layers. It is used to control electric current in various types of applications. Specifically, DIACs and SIDACs are two types of thyristors. In this article, we will discuss the applications fields and working principles of these two devices.DIACsDIACs, also known as bilateral devices, are commonly used for triggering pulses in consumer electronics and for controlling current in larger appliances and industrial equipment. Their application field is usually in circuits that require a low-level gate turn-on voltage.The underlying work principle of a DIAC is its ability to maintain a current flow regardless of the voltage across its terminals. This is achieved by its two PN junctions that act as a bi-directional semiconductor switch.When a DIAC is forward biased, it acts as an ideal current source in the same way a resistor would. When a voltage is applied across its terminals, it continuously increases until it reaches point called the "breakdown voltage". At this point, the DIAC switches to a low resistance state, allowing current to flow in both directions.SIDACsSIDACs, also known as unidirectional devices, are commonly used for overvoltage and overcurrent protection in consumer electronics and for replacement of mechanical relays. Their application field is usually in circuits that require a high-level gate turn-on voltage.The underlying work principle of SIDACs is similar to that of DIACs, in that it has two PN junctions. However, unlike DIACs, the SIDAC does not act as a constant voltage source. Instead, it will switch to a low resistance state when the forward voltage across the terminals reaches its "breakover voltage".When a SIDAC is forward biased, it behaves like a resistor. When the forward bias voltage reaches its breakdown voltage, the SIDAC switches to a low resistance state, allowing current to flow in one direction only. Following this, additional voltage increases the current until the "breakover voltage" is reached, and then the current drops back to the original value.ConclusionDIACs and SIDACs are two types of thyristors that have a variety of applications. They differ in the way they respond to voltages applied across their terminals, but the underlying principle is still the same. Both DIACs and SIDACs are used in a wide range of applications in consumer electronics and in industrial equipment to control current and trigger pulses.

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